.middle {
    width: 1000px;
    border: 1px solid red;
    margin: 50px auto;
}

.middle > div:nth-child(2) > div {
    display: flex;
    justify-content: center;
    margin: 50px auto;
}

.middle > div:nth-child(2) > div > div > div:first-child {
    text-align: center;
}

/*输入框外面的div*/
.middle > div:nth-child(2) > div > div > div:nth-child(2) {
    display: flex;
    justify-content: center;
}

.middle > div:nth-child(2) > div > div > div:nth-child(2) input[type=text] {
    width: 600px;
    height: 50px;
    background-color: rgb(238, 238, 238);
    border: 1px dashed red;
    padding: 0 10px;
    font-size: 20px;
}

.middle > div:nth-child(2) > div > div > div:nth-child(2) textarea {
    width: 600px;
    height: 150px;
    background-color: rgb(238, 238, 238);
    border: 1px dashed red;
    padding: 0 10px;
    font-size: 20px;
}

.middle > div:nth-child(2) > div > div > div:nth-child(2) > div > div > div:first-child {
    line-height: 50px;
}

/*提交按钮*/
.middle > div:nth-child(2) > div > div > div:nth-child(3) {
    width: 150px;
    height: 50px;
    line-height: 50px;
    margin: 30px auto;
    background-color: #e69137;
    text-align: center;
    color: white;
    border-radius: 45px;
    cursor: pointer;
}
.middle > div:nth-child(2) > div > div > div:nth-child(3):hover{
    background-color: skyblue;
}